Broken Marriage

Well girls I just need someone to talk to I have nobody... I am 20 years old and just got married in April my husband has history of cheating threw out our relationship... well I now just found a secret fb talk to all the same girls and now I feel hurt and stupid I look so dumb. My heart is crushed once again last year he almost got a girl pregnant but it turned out to not be his.... I thought we were past this what should I do I can't even talk to him cause he denies everything! I barely get to talk. We been together for 3 years but I feel like this is the end.